What would your total be on a pizza that cost $12.50 pre-tax, the tax was 9% and you tipped 10% on the pre-tax amount.

To calculate the total cost of the pizza, you first need to determine the amount of tax and the amount of tip.

Tax amount = 9% of $12.50 = 0.09 * $12.50 = $1.125
Tip amount = 10% of $12.50 = 0.10 * $12.50 = $1.25

Now, add the pre-tax cost, tax, and tip together:
Total cost = $12.50 + $1.125 + $1.25 = $14.875

Rounded to two decimal places, your total cost on the pizza would be $14.88.